Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21743041l&link_type=abstract
American Astronomical Society, AAS Meeting #217, #430.41; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
The SDSS equatorial stripe (stripe 82) and the parallel stripes (stripe 86 and 79) contain spectroscopic data for over tens of thousand stars in total. We have identified and analysed Sagittarius debris through the radial velocity of the stars. The stars in the stream have a global radial velocity different from the stars in the halo, and they also have their own velocity dispersion. This dispersion gives an important constraint on simulations of the Sagittarius stream, which can determine the mass of the progenitor and also diagnose the gravitational potential of the Milky Way. Combined with photometry, a blue horizontal star and blue stragglers sample of Sagittarius debris stars have been obtained. The samples are thought to be clean, which means the contamination from the smooth halo is constrained to be very low. Using the wide variety of information available for these stars (metallicity, radial velocity, gravity, photometry), we are able to gain deep insights into the nature of the Sagittarius system. There is probably another stream intersect sagittarius stream at this area. This new stream has different radial velocity than sagittarius in the position of stripe 82. This stream can also be detected in the BHB sample from stripe 86 and 79. It is most likely to be the Cetus Polar Stream recently reported.
Ling Zhu
Smith Marcie
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